Bangai-O Spirits: run (but not too fast)

I worked out how to get through the Mr Driller level - taking it slowly worked, but it was tricky to get through the last gap before the blocks fell down.

Now I'm on a level where you have to run through a twisty passage - or rather walk, since the walls are lined with explosives. Except these explosives are set off by a missile at the start, so you've got to rush. And there are blocks in the way that need to be destroyed, except you can't fire too much at them or you'll set explosives off in front of you and behind you, and you'll die.